memory_region_allocate_system_memory() API is going away, so
replace it with memdev allocated MemoryRegion. The later is
initialized by generic code, so board only needs to opt in
to memdev scheme by providing
  MachineClass::default_ram_id
and using MachineState::ram instead of manually initializing
RAM memory region.

PS:
 remove no longer needed MCIMX7Sabre

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/arm/mcimx7d-sabre.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/hw/arm/mcimx7d-sabre.c b/hw/arm/mcimx7d-sabre.c
index 0d1f62d..de1e264 100644
--- a/hw/arm/mcimx7d-sabre.c
+++ b/hw/arm/mcimx7d-sabre.c
@@ -21,15 +21,10 @@
 #include "qemu/error-report.h"
 #include "sysemu/qtest.h"
 
-typedef struct {
-    FslIMX7State soc;
-    MemoryRegion ram;
-} MCIMX7Sabre;
-
 static void mcimx7d_sabre_init(MachineState *machine)
 {
     static struct arm_boot_info boot_info;
-    MCIMX7Sabre *s = g_new0(MCIMX7Sabre, 1);
+    FslIMX7State *s;
     int i;
 
     if (machine->ram_size > FSL_IMX7_MMDC_SIZE) {
@@ -45,15 +40,12 @@ static void mcimx7d_sabre_init(MachineState *machine)
         .nb_cpus = machine->smp.cpus,
     };
 
-    object_initialize_child(OBJECT(machine), "soc",
-                            &s->soc, sizeof(s->soc),
-                            TYPE_FSL_IMX7, &error_fatal, NULL);
-    object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_fatal);
+    s = FSL_IMX7(object_new(TYPE_FSL_IMX7));
+    object_property_add_child(OBJECT(machine), "soc", OBJECT(s), &error_fatal);
+    object_property_set_bool(OBJECT(s), true, "realized", &error_fatal);
 
-    memory_region_allocate_system_memory(&s->ram, NULL, "mcimx7d-sabre.ram",
-                                         machine->ram_size);
-    memory_region_add_subregion(get_system_memory(),
-                                FSL_IMX7_MMDC_ADDR, &s->ram);
+    memory_region_add_subregion(get_system_memory(), FSL_IMX7_MMDC_ADDR,
+                                machine->ram);
 
     for (i = 0; i < FSL_IMX7_NUM_USDHCS; i++) {
         BusState *bus;
@@ -63,7 +55,7 @@ static void mcimx7d_sabre_init(MachineState *machine)
 
         di = drive_get_next(IF_SD);
         blk = di ? blk_by_legacy_dinfo(di) : NULL;
-        bus = qdev_get_child_bus(DEVICE(&s->soc.usdhc[i]), "sd-bus");
+        bus = qdev_get_child_bus(DEVICE(&s->usdhc[i]), "sd-bus");
         carddev = qdev_create(bus, TYPE_SD_CARD);
         qdev_prop_set_drive(carddev, "drive", blk, &error_fatal);
         object_property_set_bool(OBJECT(carddev), true,
@@ -71,7 +63,7 @@ static void mcimx7d_sabre_init(MachineState *machine)
     }
 
     if (!qtest_enabled()) {
-        arm_load_kernel(&s->soc.cpu[0], machine, &boot_info);
+        arm_load_kernel(&s->cpu[0], machine, &boot_info);
     }
 }
 
@@ -80,5 +72,6 @@ static void mcimx7d_sabre_machine_init(MachineClass *mc)
     mc->desc = "Freescale i.MX7 DUAL SABRE (Cortex A7)";
     mc->init = mcimx7d_sabre_init;
     mc->max_cpus = FSL_IMX7_NUM_CPUS;
+    mc->default_ram_id = "mcimx7d-sabre.ram";
 }
 DEFINE_MACHINE("mcimx7d-sabre", mcimx7d_sabre_machine_init)
-- 
2.7.4